EP2956274A1

EP2956274A1 - Detachable blocking device, in particular on a clamping tool

Info

Publication number: EP2956274A1
Application number: EP14705997.6A
Authority: EP
Inventors: Zbigniew Noniewicz; Hans-Jürgen Schüller
Original assignee: Wolfcraft GmbH
Current assignee: Wolfcraft GmbH
Priority date: 2013-02-14
Filing date: 2014-02-11
Publication date: 2015-12-23
Anticipated expiration: 2034-02-11
Also published as: WO2014124941A1; US20150375369A1; EP2956274B1; US9579775B2; DE102013101479A1

Abstract

The invention firstly relates to a detachable blocking device, in particular on a clamping tool, e.g. on a clamp, comprising a blocking element (10), which inhibits the displacement capability of a rod (1) in at least one detachment direction (L) in a blocking position, and a detachment member (7), which displaces the blocking element (10) into a release position when moved from a default position into a detachment position, in which release position the rod (1) can be displaced at least in detachment direction. A braking element (25) is disclosed, which acts upon the rod (1) in a braking position such that the rod (1) can be displaced only after a braking force acting against the direction of displacement of the rod (1) has been neutralised, which braking force may not be neutralised in a sliding position of the braking element (25), wherein the braking element (25) has a braking lever, and/or the braking element can be brought into its sliding position by pivoting an arm (11) of the detachment member (7) which has a detachment lever.

Description

Detachable locking device, in particular on a clamping tool

The invention relates to a releasable locking device, in particular to a clamping tool, for example. On a clamp with a blocking element blocking the displacement of a rod in a blocking position, at least in a release direction, and a release member, the blocking element in its displacement from a basic position to a release position Relocated release position in which the rod is displaced, at least in the release direction. The invention also relates to a clamp having a first jaw bearing rod and a second jaw bearing housing, which has a drive member, by the repeated successive actuation of the rod stepwise in a release direction opposing clamping direction is displaced.

Such a clamp describes EP 0 997 232 B1. Within the housing there is a blocking element which blocks the displaceability of the rod in the release direction in a blocking position. With the drive member, the two jaws can be brought into a clamping position. The two jaws can be moved towards or away from each other. In the latter case, the clamp acts as a spreading clamp. There is provided a release member which, when displaced from a home position, displaces the blocking member into a release position, in which the rod can be displaced both in the release direction and in the opposite direction of tensioning. The blocking element is formed there by a steel plate which has a window through which the rod is guided. The window edges dig in the blocking position in surface sections of the rod. When the release member is actuated, the blocking element is moved out of the tilted position. brought, so that the rod can shift through the window. The release member cooperates there with the blocking element in such a way that the rod can be displaced stepwise in the release direction by means of a repeated successive displacement of the release member beyond the release position. The blocking element is thereby pushed by the release member in the tensioning direction over the rail, wherein a return displacement spring is tensioned. The return spring is capable of bringing the blocking element into a tilted position in order to displace the blocking element together with the rod fastened thereto.

The invention has for its object to further develop a releasable blocking device or a clamping tool equipped therebenefits advantage. The object is achieved by the invention specified in the claims.

First and foremost, a brake element is proposed. At least in its blocking position, the blocking element develops a movement-inhibiting effect with respect to the rod in the release direction. If the blocking element is brought from the basic position into the release position, then it depends on the respective design of the blocking device or of the clamping tool as to whether the rod is freely displaceable relative to the blocking element, that is to say without appreciable friction. With the fiction, proposed brake element is a displacement of the rod in the release position only after Ü overcoming a braking force possible. According to the invention, the brake element can be brought from its braking position into a sliding position. This can be done by a physical displacement of the brake element. In the sliding position, the additional braking force must not be overcome. In the sliding position of the brake element, the braking force is not effective. The braking force is canceled here. It can be provided that in the sliding position, the rod can be displaced solely by the application of gravity. However, the braking force is preferably so great that the rod can not be displaced in the braking position alone by gravity. In a further development of the invention, it is provided that the brake element can be brought from the braking position into the sliding position by a displacement of the release member beyond the release position. The braking element may have a braking flank which, in the braking position, bears against a surface section of the rod in a force-acting manner in the braking position. The rod is then preferably held in the braking position by static friction. The braking force is then a frictional force which is exerted by the preferably spring-loaded brake flank on the upper surface portion of the rod. The displacement of the brake element from the braking position into the sliding position then causes the brake flank to disengage from the rod, the frictional force is then released. The rod may be a flat steel rod that can form a tie rod or push rod relative to the action of jaws. The brake element may be a brake lever. The brake lever can be one-armed. Preferably, the brake lever is pivotally mounted about a bearing pin on a housing which also receives the release member and the blocking member. The brake lever may have axle extensions, which engage in corresponding bearing openings of the housing wall. , Also, the release member may be pivotally associated with the housing about a bearing pin. The release member can form a two-armed lever. A lever arm projects out of the housing as an actuating section. Another lever arm can do that

Apply brake element when the release lever is pivoted. Preferably, the brake element is only acted on by the release lever when the release lever moves the blocking element a certain distance along the rail. Gert, wherein during this displacement of the blocking element on the rail, the position of the rail is held by the braking element. The loading of the brake element is preferably carried out by the intermediary of the blocking element. In this case, the blocking element is acted upon by the release lever and in turn acts on the brake element. The brake element may have a window through which the rod is guided. A soffit portion of the window, which may be a narrow side of the window, is acted upon in the braking position a portion of the rod, which is preferably a narrow side portion. The brake element is preferably by a spring, in particular a compression spring in the

Brake position held. If the brake element is frictionally engaged with its braking surface on the surface of the rod, the frictional force is generated by the spring. Preferably, the spring extends in the displacement direction of the rod. Their effective direction is their extension direction. The blocking element according to the invention can be formed by a steel plate with a window. Through the window, the rod is guided. The window forms edges which cooperate in a blocking position as a result of tilting of the steel plate with the rod upon application of a force in the longitudinal direction of the rod with a surface portion of the rod. The edges can dig into the surface sections of the bar. With similar means, the rod can be relocated in the clamping direction. For this purpose, a clamp has a drive lever which is pivotable. An arm of the drive lever projecting into the housing acts on a drive element. The drive element can also be formed by a steel plate with a window through which the rod is guided. If the drive lever is pivoted, the drive elements tilt on the rod. They are displaced relative to the housing during pivoting of the drive lever and take the rod in the clamping direction. The blocking element is from a return displacement spring held in the blocking position. As a result, the clamp can be brought into a clamping position. To bring the clamp from the clamping position, which may also be an expanded position, the release member, so preferably the release lever to operate. The blocking element is thereby brought into its release position. It can be further pushed over the rod by further pivoting of the release member against the restoring force of the return displacement spring. The rod is held in position by the brake element. If the release member is released, it is displaced by a spring back to the normal position. The return displacement spring pulls the locking element tilted with the rod back into the basic position, whereby the rod is also displaced. If the release member, so in particular the release lever moved to an end position, the brake element is brought out of action. The brake element then leaves its braking position and assumes a sliding position in which the rod can be moved freely through the housing. With the fiction, contemporary device is thus both a gradual shift of the rod in the clamping direction and a gradual shift of the rod in the release direction possible. This is done by a multiple operation of either a drive lever or a release lever. The fiction, contemporary clamp has at the end of the rod a jaw whose clamping surface is opposite in a clamping surface of a housing-fixed jaw. However, the jaw associated with the rod can also have a clamping surface which points away from the clamping surface of the housing-fixed clamping jaw. In this case, it is a Spreizzwinge. An embodiment of the invention will be explained below with reference to accompanying drawings. Show it:

A tension clamp according to the invention in a side view, 2: enlarges the detail II-II in FIG. 1 with the housing cover removed in a basic position, FIG. 3 shows a view according to FIG. 2, but in a release position, FIG.

FIG. 4 shows a sequence illustration of FIG. 3 after swinging back a

Release lever from the release position to the basic position, Figure 5: a sequence to Figure 3, after a further displacement of the release lever to a sliding position,

6 shows a section according to the line VI-VI in Figure 2, Figure 7: the section along the line VII-VII in Figure 5, and

FIG. 8: a perspective, partially broken view of the

Housing. The drawings show a clamp with a housing 2, which has a housing chamber, which is covered by a housing cover, wherein in the housing chamber, a drive gear and a releasable locking device is arranged. From the housing protrude an arm of a release lever 7 and a drive lever 6. The drive lever 6 and the release lever 7 are pivotable in the direction of a handle 5. On the levers 6, 7 and the handle 5 opposite side, the housing 2 carries a fixed jaw 4. The housing has two housing openings 22, 23, in which a push or pull rod 1 is guided. At the two ends of the rod 1 can be a Clamping jaw 3 bearing head to be attached. With the drive lever 6, the rail 1 can be gradually shift in a clamping direction S. With the release lever 7, the rail 1 can be gradually shifted in the direction opposite to the clamping direction S loosening direction L. In the operating position shown in FIG. 1, the head carrying the clamping jaw 3 is fastened to the rail 1 in such a way that the clamping surfaces of the clamping jaws 3, 4 face one another. If the rail 1 is displaced in the clamping direction, the two clamping jaws 3, 4 move towards each other. In an operating position, not shown, of the clamping jaw 3 supporting head sits at the other end of the rod 1, so that the jaws 3, 4 move away from each other in a displacement of the rail 1 in the clamping direction S.

In order to shift the rod 1, which is a steel strip with a rectangular cross-section, in the tensioning direction S, the drive lever 6 must be pivoted in the direction of the handle 5. The drive lever 6 pivots about a pivot pin 19 which is disposed within the housing chamber. A drive cam 20 acts on one end of a drive element 8, which is formed by a double steel plate. The drive element 8 is supported in a non-actuated position on an abutment 31, so that the rod 1 can slide substantially freely through a window of the drive element 8. The compression spring 9 forms a return spring of the drive element 8, which holds the drive element 8 in the basic position. If the outer arm of the two-armed drive lever 6 is pivoted, the other, the drive cam 20 forming arm of the drive lever 6 pivots in the opposite direction and leads to a tilting of the drive element 8 on rail 1. When the drive lever 6 is displaced, the drive element 8 releases from the abutment 31 and is in the tensioning direction S shifted, the rod 1 is dragged due to the tilting. A blocking element 10 causes in its blocking position a Rückverlage- tion lock. The blocking element 10 is designed so that the rod 1 can be displaced in the clamping direction S relative to the blocking element 10. If the drive lever 6 is released, the return spring 9 displaces the drive element 8 back into the basic position.

By repeated such actuation of the drive lever 6, the two clamping jaws 3, 4 can be gradually shifted and brought into a clamping position.

In order to bring the clamp from the clamping position in a release position, the protruding from the housing 2 arm of the release lever 7 must be pivoted in the direction of the handle 5. The release lever 7 has a bearing eye 13 with which the release lever 7 is pivotably mounted on a bearing journal 12 fixed to the housing 2. An arm 11 of the release lever 7 projecting into the housing has a lever end 18 which can act against a blocking element 10. 2, one end 10 "of the blocking element 10 is supported on a stop 16 of the housing 2. The opposite end 10 ', which can also be acted upon by the lever end 18, is supported by means of is acted upon by a return displacement spring 14 acting on it in the release direction L. The return displacement spring 14 is fastened with its other end to an attachment point 21 of the housing. The blocking element 10 has a window 24, which has sharp window edges. Through the window 24, the rod 1 is guided. The return displacement spring 14 holds the blocking element 10 in a tilted position in which the edges of the window edge engage the narrow sides 27 of the rod 1 in such a way that the rod 1 can not be displaced in the release direction L, but rather in the tensioning direction S with respect to the blocking element 10 ,

If the release lever 7 is pivoted into the release position shown in Figure 3, which element by attack of the lever end 18 in the region of the end 10 'of the blocking element, ie in the region of the attack occurs the return displacement spring 14, the other end 10 "detaches from the stop 16. In this case, the edges of the window 24 from the Beaufschlagungsstellung, so that the rod 1 can be displaced not only in the clamping direction S, but also in the release direction L against the blocking element 10.

In order to avoid that in this release position the rod 1 can be easily displaced relative to the housing 2, a braking element 25 is disposed within the housing chamber of the housing 2. The brake member 25 is pivotally mounted about a pivot axis 28 in the housing. To this end protrude from the brake element 25 axle stub 28, which engage in opposite openings of the housing walls.

Trained as a brake lever brake element 25 has a rectangular window 29 through which the rod 1 protrudes. A window narrow wall forms a braking flank 26, which may have a rounded surface. In the braking position shown in Figures 2 and 6, the braking edge 26 is pressed by the force of the spring 30 against a surface portion 27 of the rod 1. The surface portion 27 is the narrow side of the Rod 1. The spring 30 is a compression spring and is located in a spring receiving chamber. Their direction of action is parallel to the direction of displacement of the rod 1. The spring 30 is supported with its one end to the bottom of their receiving chamber. The other end of the spring 30 acts against the free end of the brake lever 25. The spring thus generates a force which, as a result of the articulation 28, is converted into a normal force which presses the brake flank 26 against the surface section 27 of the rod. In this case, a frictional force is generated. This force corresponds to a braking force that must be overcome in order to shift the rod 1 in the braking position of the brake element 25 either in the clamping direction S or in the release direction L.

Is released starting from the release position shown in Figure 3, the release lever 7, he is retracted by an associated return spring 15, which also acts on the fastening 21, in the normal position. In this case, the lever end 18 from the end 10 'of the blocking element 10 is released. The return displacement spring 14 develops a restoring force on the blocking element 10, which is greater than the braking force caused by the brake element 25. This has the consequence that the return displacement of the blocking element 10 entrains the rod 1 in the release direction L as a result of its tilting on the rod 1.

FIG. 4 shows an intermediate position in which the blocking element 10 has tilted on the rod 1, but which has not yet moved. The release lever 7 has detached from the blocking element 10, so that only the spring 14 acts on the blocking element in order to displace the blocking element 10 in the release direction L. The displacement takes place together with the rod 1. If the release lever 7 is pivoted further from the release position shown in FIG. 3, it moves the blocking element 10 further in the direction of the brake element 25, since the blocking element 10 is arranged between the release lever 7 and the brake element 25.

In the final phase of the pivoting of the release lever 7, the free end of the brake element 25 is acted upon by the blocking element 10. This corresponds to an action on the brake element 25 by the release lever 7 with the interposition of the blocking element 10. This relative displacement leads to a pivoting of the brake element 25 about its pivot axis 28, wherein the spring 30 is tensioned. Along with this pivotal displacement of the brake element 25, the brake flank 26 releases from the surface portion 27 of the rod 1, so that the brake element assumes its sliding position. In this sliding position, the braking force to be overcome for displacing the rod 1 is eliminated. In addition, since the blocking element 10 is supported on a stop 17 such that the rod 1 can slide freely through the window 24, the rod 1 can move in this sliding position only by attack of gravity. It is smoothly guided in the windows 29 and 24. If the release lever 7 is released again, the spring 30 displaces the brake element 25 from the sliding position back into the braking position, in which the brake flank 26 acts on the rod 1 in a manner that restrains movement. The blocking element 10 is released with its end 10 "from the stop 17 and reaches a Verkantstellung (Figure 4), in which it travels with its return to the basic position in the manner described above, the rod 1 in the release direction L.

The flank, on which the braking element 25 acts on the blocking element 10, has a rounding. Rearward of this rounding, the spring 30 is supported. The return displacement spring 14 and the return spring 15 are each formed as tension springs. The above explanations serve to explain the inventions as a whole, which in each case independently develop the state of the art, at least by the following combinations of features, namely: A releasable blocking device characterized by a braking element acting on the rod in a braking position in such a way that the Bar is displaced only after overcoming a force acting against the displacement direction of the rod braking force, which braking force in a sliding position of the brake element does not need to be overcome.

A releasable locking device, which is characterized in that the brake element can be brought by a beyond the release position displacement of the release member of the braking position in the sliding position. A releasable locking device, characterized in that the

Bremselement has a braking edge, the force in the braking position abuts a surface portion of the rod and is spaced in the sliding position of the surface portion. A releasable locking device, characterized in that the brake element (25) has a brake lever A releasable locking device, which is characterized in that the braking element can be brought into its sliding position by pivoting an arm of the release lever having a release member. A releasable locking device characterized in that the braking member is pivotable about a pivot axis fixed to a housing supporting the release member and the brake member.

A releasable locking device, characterized in that the braking element has a window through which the rod is guided, wherein a portion of the soffit of the window forms the braking edge, which in particular frictionally cooperates with the rod.

A releasable locking device, which is characterized in that the braking element is acted upon by a spring acting in the displacement direction of the rod.

A releasable locking device, characterized in that the blocking element is a steel plate with a window through which the rod is guided, which window has edges in the blocking position as a result of tilting of the steel plate with the rod upon application of a force in the release direction on the rod cooperates with the surface of the rod.

A tension clamp, which is characterized in that the rod is gradually displaced in the release direction by means of a repeated successive displacement of the release member beyond the release position A releasable locking device, which is characterized in that the blocking element is acted upon by a return displacement spring in the release direction

A releasable blocking device, which is characterized in that the blocking element in the release position against a stop.

A tensioning clamp, which is characterized in that the housing has a releasable locking device, in particular according to one or more of the preceding claims.

All disclosed features are essential to the invention (individually, but also in combination with one another). The disclosure of the associated / attached priority documents (copy of the prior application) is hereby also incorporated in full in the disclosure of the application, also for the purpose of including features of these documents in claims of the present application. The subclaims characterize in their optionally sibling version independent inventive developments of the prior art, in particular to make based on these claims Teilanmel- fertilize.

LIST OF REFERENCE NUMBERS

1 pole 21 attachment point

2 housing 22 guide opening

3 clamping jaw 23 guide opening

4 clamping jaw 24 windows

5 handle 25 brake element

6 drive lever 26 braking edge

7 release lever 27 surface section

8 drive element 28 pivot axis

9 return spring 29 window

10 blocking element 30 spring

11 lever arm 31 abutment

12 journals

13 bearing eye

14 Return displacement spring L Release direction

15 Return spring S Clamping direction

16 stop

17 stop

18 lever end

19 pivot

20 drive cams

Claims

In a blocking position, the displaceability of a rod (1) blocked at least in a release direction (L), and a release member (7), the. In a blocking position on a tensioning clamp with a blocking element (10) its displacement from a basic position into a release position displaces the blocking element (10) in a release position, in which the rod (1) is displaceable at least in the release direction, characterized by a braking element (25) in a braking position on the rod (1) acts, that the rod (1) is displaced only after overcoming against the displacement direction of the rod (1) acting braking force, which braking force in a sliding position of the brake element (25) does not have to be overcome. 2. Detachable locking device according to claim 1, characterized in that the braking element (25) can be brought from the braking position into the sliding position by a displacement of the release member (7) which exceeds the release position. 3. Detachable locking device according to one or more of the preceding claims, characterized in that the braking element (25) has a braking edge (26) which in the braking position kraftbeaufschlagt on a surface portion (27) of the rod (1) and in the sliding position of Surface portion (27) is spaced.

Detachable locking device according to one or more of the preceding claims, characterized in that the brake element (25) has a brake lever.

5. Detachable locking device according to one or more of the preceding claims, characterized in that the braking element can be brought into its sliding position by pivoting an arm (11) of the release lever having a release lever (7).

6. Detachable locking device according to one or more of the preceding claims, characterized in that the braking element (25) is pivotable about a swivel axle (28) mounted on a release member (7) and the brake element (25) ,

7. Detachable locking device according to one or more of the preceding claims, characterized in that the braking element (25) has a window (29) through which the rod (1) is guided, wherein a portion of the soffit of the window (29) forms the braking edge (26), which cooperates in particular frictionally engaged with the rod (1).

8. Detachable locking device according to one or more of the preceding claims, characterized in that the braking element (25) is acted upon by a spring (30) acting in the direction of displacement of the rod (1).

9. Detachable locking device according to one or more of the preceding claims, characterized in that the blocking element (10) is a steel plate with a window (24) through which the rod (1) is guided, which window has edges which in the blocking position as a result of tilting of the steel plate with the rod (1) upon application of a force in the release direction (L) on the rod (1) with the surface (27) of the rod (1) cooperates.

10. Detachable locking device according to one or more of the preceding claims, characterized in that the rod (1) by means of a successive succession of displacement of the release member (7) beyond the release position stepwise in the release direction (L) is displaced.

11. Detachable locking device according to one or more of the preceding claims, characterized in that the blocking element (10) by a return displacement spring (14) in the release direction (L) is acted upon.

12. Detachable locking device according to one or more of the preceding claims, characterized in that the blocking element (10) in the release position against a stop (17) occurs.

13. Clamp with a first jaw (3) carrying rod (1) and a second jaw (4) carrying the housing (2) having a drive member (6), by the actuation of the rod (1) in a release direction (L) oppositely directed clamping direction (S) is displaceable, characterized in that the housing has a releasable locking device, in particular according to one or more of the preceding claims.

14. Clamp and releasable locking device characterized by one or more of the characterizing features of one of the preceding claims.